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The 2000 Census showed that Cassia County had a population of 21,416 people. This represented 1.66% of the total population of Idaho, making it the state's 13th most populous county (out of 44 counties).

From the Census Estimates for 2009<1>, Cassia had a population of 21,698 people. This is an increase of 1.32% since the 2000 Census.

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
201022,952+7.17%+5.78% since 2009
200921,698+1.32%+1.17% since 2008
200821,447+0.14%+2.33% since 2007
200720,959-2.13%+1.02% since 2006
200620,747-3.12%-0.82% since 2005
200520,919-2.32%-0.23% since 2004
200420,967-2.1%-1.08% since 2003
200321,195-1.03%-0.66% since 2002
200221,336-0.37%-0.65% since 2001
200121,475+0.28%+0.28% since 2000
200021,416The Last Census

Cassia County had 7,862 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Cassia County has a total area<3> of 2,580 square miles [6,682 km²]. Of this total, only a minor amount of that area is covered by water (13.86 square miles [35.9 km²]).

Using the above population and land area values, Cassia County had a population density of 8.34 people per square mile [3.22 people/km²], making it the state's 22nd most densely populated county (out of 44 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Cassia County is available. The QuickFact also contains a comparison between Cassia and the state of Idaho.

Click here for the Cassia County QuickFact (QF-16031).

Below are some of the communities that are located in Cassia County:

(2009 Est)
(2000 Census)
Change in

Below are the counties that adjoin and form the boundaries of Cassia County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
BlaineQF-16013   N22,32818,99117.57%
JeromeQF-16053   NW21,26218,34215.92%
MinidokaQF-16067   N19,22620,174-4.7%
OneidaQF-16071   E4,2214,1252.33%
PowerQF-16077   NE7,7347,5382.6%
Twin FallsQF-16083   W75,29664,28417.13%
Elko (NV)QF-32007   SW47,89645,2915.75%
Box Elder (UT)QF-49003   SE49,90242,74516.74%

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U.S. Census Bureau
Census QuickFact for Cassia County

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

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<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Cassia. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

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<4>All Quarter-dollar coin images from the United States Mint.

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